Social media has become a medium for teachers to use in the process of teaching English, and Live Streaming YouTube is one of the social media platforms that is used in speech activities in learning process. This study aims to investigate the types of Illocutionary Acts used by the teacher in teaching English through live streaming YouTube. This study applies qualitative research approach with case study research method. The research subjects were selected by using Purposive Sampling technique. As a result, the subjects of the research are two English teachers of SMP Unismuh Makassar who taught English via Streaming YouTube. Based on the findings, the researcher found four types of illocutionary acts used by teachers in the teaching and learning process. Those are Directive, Expressive, Commissive, and Assertive. The directive speech act was found to be the most common illocutionary act with 136 utterances. The reason was because it has several functions in learning process such as to check the students’ knowledge of certain information, and to give instructions to them (ask the students to do something). The next type of illocutionary acts found is expressive with 55 utterances, followed by commissive with 14 utterances. And the least data found is assertives with 3 utterances. On the other hand, there were no findings of declarative speech act types in the English teaching and learning process.